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DEXA scan of the tibia in the anterior–posterior projection with the three regions of interest. ROI 1: Periprosthetic tibial bone from the center of prosthesis to medial edge of the proximal tibia, length 4 cm. ROI 2: Periprosthetic tibial bone from the center of the prosthesis to the lateral edge of the tibia, length 4 cm. ROI 3: Full width of the tibia distal to ROI 1 and RO 2, length 2 cm.
